CVE-2026-84969Heap overflow via truncated base64 encoding of binary fields in length-limited JSON output
Updated under an hour ago ()
Does this affect you?
It affects MongoDB C Driver. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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A memory-handling error in the BSON-to-JSON conversion helpers of the MongoDB C Driver can write a small number of bytes past the end of a heap buffer when a binary field is encoded and the output is cut short at a caller-configured length limit. A party who supplies the document content, with no privileges on the application that links the driver, may cause a small amount of data outside the intended buffer to be altered.
- CVSS
- 3.7 LOW (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
- Weakness (CWE)
- CWE-787
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- mongodb
- NVD analysis
- Analyzed
- Record last updated
- Sep 3, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
MongoDB C Driver mongodb:c_driver (from the name) | from 1.30.0 before 1.30.9; from 2.0.0 before 2.5.2 | CNA record |
mongodb c_driver mongodb:c_driver | from 1.30.0 before 1.30.9; from 2.0.0 before 2.5.2 | NVD |
References
- https://jira.mongodb.org/browse/CDRIVER-6410vendor-advisory, issue-tracking
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.